Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Clean preparation process for hexafluropropylene oxide

A technology of hexafluoropropylene oxide and hexafluoropropylene is applied in the field of green preparation of hexafluoropropylene oxide, and can solve problems such as the destruction of atmospheric ozone layer

Active Publication Date: 2005-07-06
SINOCHEM LANTIAN +1
View PDF5 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problem that the existing hexafluoropropylene oxide preparation method has a destructive effect on the atmospheric ozone layer, and provides an environmentally friendly preparation method of hexafluoropropylene oxide

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 500g of supercritical HFC-227ea and 100g of hexafluoropropylene into a 1-liter stainless steel reactor with stirring, and gradually raise the temperature to 120°C. After stabilizing the temperature for half an hour, slowly introduce oxygen until the partial pressure of oxygen reaches 0.2MPa Oxygen was then stopped. Due to the exothermic reaction, the reaction temperature and pressure rise, so the oxygen should be fed again after the reaction temperature and pressure are recovered and stabilized, and the partial pressure of oxygen is controlled to be 0.2MPa. Oxygen was fed repeatedly in this way, and the reaction product was analyzed by gas chromatography after 12 hours. The calculated conversion rate of hexafluoropropylene was 99.4%, the selectivity of hexafluoropropylene oxide was 43.5%, and no reaction induction period was observed.

Embodiment 2

[0023] The reaction apparatus and operating conditions are the same as in Example 1, but the supercritical fluid is changed to HFC-143a to obtain a conversion rate of 89.1% of hexafluoropropylene, and the selectivity of hexafluoropropylene oxide is 34.4%. It is observed that the reaction has 3 hours induction period.

Embodiment 3

[0025] The reaction device and operating conditions are the same as in Example 1, but the supercritical fluid is changed to HFC-134a, and the reaction time is 10 hours. The obtained conversion rate of hexafluoropropylene was 96.8%, the selectivity of hexafluoropropylene oxide was 44.3%, and an induction period of 2 hours was observed for the reaction.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an environmental protection method for preparing hexafluropropylene oxide from hexafluoropropylene by dioxygen liquid phase oxidation method. The method employs at least one supercritical fluid as solvent for replacing the CFCs with destructive effect to atmospheric ozone layer. The supercritical fluid as solvent is used in the invention which can reduce induction period of reaction and prevent the temperature raise in short time at the beginning of reaction.

Description

technical field [0001] The invention relates to a green preparation technology of hexafluoropropylene oxide, which uses supercritical fluid as a solvent to prepare hexafluoropropylene oxide by liquid-phase oxidation of hexafluoropropylene. technical background [0002] Hexafluoropropylene oxide is an important fluorine-containing intermediate and an important raw material for the production of hexafluoroacetone, perfluoroisopropanol, perfluoropolyether and perfluorovinyl ether. [0003] There are many preparation methods of hexafluoropropylene oxide, such as photochemical oxidation and radiochemical oxidation. Patent GB1034492 and patent UK931578 have introduced that hexafluoropropylene can be oxidized to generate hexafluoropropylene under the triggering of light and different ionizing radiation sources. However, this method has unfavorable factors such as complex equipment and relatively dangerous reactions. In addition, patent US3775438 and patent JP52053804 also reported...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C07D305/04
CPCY02P20/54
Inventor 张建君徐宇威徐卫国陈先进
Owner SINOCHEM LANTIAN
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com